Make full version an in-app purchase (uniting SafeMode and SafeModeLite)

```
Users should just download SafeMode (previously SML) and instead of a message 
saying "you can't do that," they should get a message asking if they want to 
purchase the full version.
```

Original issue reported on code.google.com by `mikedabo...@gmail.com` on 12 Jun 2013 at 1:53
